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Sheared screws in mast step

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Post Options Post Options   Quote Sam.Spoons Quote  Post ReplyReply Direct Link To This Post Topic: Sheared screws in mast step
    Posted: 19 Jul 19 at 9:14am
That video is excellent, I didn't want to suggest otherwise.

I agree WRT the hole saw technique if all else fails, an elegant solution.  Thumbs Up
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Post Options Post Options   Quote Chris Robinson Quote  Post ReplyReply Direct Link To This Post Posted: 19 Jul 19 at 8:12am
I agree that the techniques shown in the video are above average boat bimbling level but the purpose of linking it was to show the methods for overcoming problems that others had mentioned. I would imagine that it would not be too hard to make a pre drilled plate which could be screwed into place and would then act as a jig to drill the sheared screws out.

Personally, I like the hole saw suggestion. Simple and effective. Smile
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Post Options Post Options   Quote Sam.Spoons Quote  Post ReplyReply Direct Link To This Post Posted: 18 Jul 19 at 3:51pm
Originally posted by JimC

The big trouble with these techniques is that they require skill, experience and practice. So if someone like me without those three attributes has a go the first few attempts tend to end badly. So in the trade you might give a youngster a scrap cylinder head to practice with. If the OP boat is wood I'd be thinking that my fallback would be to drill all round the screw to extract, then drill a large hole and plug it. New screw could then go in the plug.

Exactly. The guy in the (excellent BTW) video had it easy with all the tools including access to a lathe to make his drill guides, and sheared bolts with not a sign of corrosion. Not saying he was not skilled and a video of him waiting for penetrating oil penetrating would be worse than one of paint drying but.......

If other methods fail then I too would drill oversize and use a plug of new wood too.
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Post Options Post Options   Quote 423zero Quote  Post ReplyReply Direct Link To This Post Posted: 18 Jul 19 at 12:00pm
One inch hole saw, drill down side of screw, then glue in one inch Dowell, prefix mast foot in same place.
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Post Options Post Options   Quote JimC Quote  Post ReplyReply Direct Link To This Post Posted: 18 Jul 19 at 9:11am
The big trouble with these techniques is that they require skill, experience and practice. So if someone like me without those three attributes has a go the first few attempts tend to end badly. So in the trade you might give a youngster a scrap cylinder head to practice with. If the OP boat is wood I'd be thinking that my fallback would be to drill all round the screw to extract, then drill a large hole and plug it. New screw could then go in the plug.
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Post Options Post Options   Quote Sam.Spoons Quote  Post ReplyReply Direct Link To This Post Posted: 18 Jul 19 at 9:10am
The hardest thing to find will be the left handed drills (well, a lathe to drill the guide bolts, but I guess that's not relevant in this case), Amazon is you friend. Much easier with larger, and clean, un-corroded, bolts though  Embarrassed
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Post Options Post Options   Quote Chris Robinson Quote  Post ReplyReply Direct Link To This Post Posted: 18 Jul 19 at 8:37am
https://youtu.be/dJfkCj3FWBs

This guy looks like he may have the answer. You may have to search to find the right tools though.

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Post Options Post Options   Quote Sam.Spoons Quote  Post ReplyReply Direct Link To This Post Posted: 17 Jul 19 at 3:46pm
Or use a 'drummer'  Wink
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Post Options Post Options   Quote Moomin.W Quote  Post ReplyReply Direct Link To This Post Posted: 17 Jul 19 at 3:42pm
Just a different approach for removal which is easier than drilling out. Use a small cutting disk in a dremmel to cut a slot on the top of the screw shank. You'll cut into the surrounding wood but only a slot and it helps stabilise the cut on the screw. Then use a flat head driver to unscrew.
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Post Options Post Options   Quote yottiemad Quote  Post ReplyReply Direct Link To This Post Posted: 17 Jul 19 at 3:16pm
I had the same issue in an FF, no one to blame but myself as I fitted the hull out from new.
I never tried to get the broken screws out, my screws had been installed with epoxy as lube/sealant from new so no extract tool would get them out. Just re drill the the alloy mast heel when it is removed, counter sink holes and put screws a size larger in different positions. It is an FF, a couple of grams in the hog will not make the boat over weight.
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